Rotary stamping machine



T. WUTSCHER ROTARY STAMPING MACHINE Filed Oct. 14, 1943 R o T N E v m THEODOR WU TS-CHER ATTORN 5Y5 in which the minimum Patented May 18, 1948 to. Th Loews Engineering .fCompany Limited,

mfl ns1a d a nnotation at G ea Bri ain App a i n. c er.

14, erialNo- 59 ,1

In Great Britain October 17, L942 2 Claims. 11

T inyention. reiatestoa stampin machine .usd for marking at regular intervals offmaterial. or a succession of pieces in urse'ofctheir manufacture. A special field of. appli' ation for machines. of, this kind is a rolliiig milhnwhere itis frequently desired to apply distinctive marlrings to the rolled articles as. they leave the last stand of the mill.

onefiorm of stamping machine the stamp ing die'is attached tojan arm radially extending' from a motor-driven shaft which overhangs thegtrackor conveyor on which the articles to pedare'advancedQ A stamping operation nibeperfor'med each time the. die meets a cleon this. track or conveyoron passing Ubue lpw r o i, si

1inr'r -iachines of thiski'rid, means have to be pr ees toalter the minimum distance between tli die andthe surface on which the articles to be stampedare supported order to obtain markings, or equal depth of impression with articles i ffdifierent thickness. This adjustment has to be exact, as a smallfdifference in the depth oi the marking will considerably impair its clearness.

Inoneknown form of rotary stamping machine the distance above referred to was altered by raising answering magma on which the die-carryingrarmwas mounted. This required the use of some complicated mechanism corn parable to the screwdown mechanism of a rolling mill whereby the stamping machine became rather bulky and expensive. I

Itlsi an object. ofthe invention to provide a rotaryastamping machine. of the kind described distance between the die and.the.. surface .on which the, articles tobe stamped aresupported can be adjusted in an easy manner by simple means,

-LAccordin g -to the invention, the radius of the circle which the die will describeduring the rotation of. the die-carryingarm can be varied so that the minimum distance 'bbWeen the die and the surface on which'the articles'to be stamped are supported can be altered at will without having to alter the position of the driving shaft in the stamping machine.

This can be accomplished by providing 0n the driving shaft an eccentric seat for the arm carrying the die, the angular position of the arm on the eccentric seat being adjustable so that the eccentricity of the arm relative to the motordriven shaft, and thereby the minimum distance between the die and the surface on which the a i l s t be. ia ese "ar upr me. as. be

altered;

With a. stamping machine according to. the

invention; provision "has to be made 'toTfii in.

5 the face of the diet in a position.perpehdicular.

Means are further provided in the. starnpin g mit' the machine tobe arrested in an inert position, i. e'., a position inwhichthe diemachine according.to'tlieiinventiori which er rying arm is directed away 'fromthe material'- supporting surface. 'Thesemeans may con st'oi a brake which is preier'ablyfof the electro switch operated by the" die bined with an electro-magnetic clutch.

.. ai netic type so that it can be controlled by a'li'r'nit holder arm andlco'm One example of a rotarystamping Ina cliine.

2; according to the invention will nowbe, described more in [detail with reference .tdthe accompa ing drawings in which:

' Figs; 1 an .2 are a sectionalelevation and an,

chine according to the inventiori.

s amp nef a 'rnfifram n time machinea'shaft u is sup:

p rted n ear .3,ja ndjspur.-jwheel I 2] and driven, through pin l4. from a motor I 5 A tromagnetic clutch I6 is interpos'edjbet" wheel'll and the shaft. IIQthe clutch able ma a. 2 idth is spur ed at 40 shaft. I ll Seated on the overh n ing find r s arp II is an eccentric collar I8 on whichja spli is loosely mounted. The head I m n e s rdan ular p sit n o 001131 l8 by'mea'iiso-f a bolt '21} head IS on collar I8 is brought about by means of a worm 22 arranged in head I9 and operable by hand. The Worm periphery positions of head I?! and collar 22 meshes with the toothed I8a of the collar I8, so that these meshing parts cooperate to adjust the relative angular I8, and thereby to adjust the radius of rotation of die 23, when the worm 22 is turned for this purpose.

The

holder 23 for the die, of which the impression elements appear at 23a, has a swivel or oscilla- -made to registerproperly with the surface of the billet to be stamped at any position of adjustment of the arm I9 relative to its axis of rotation, i. e. irrespective of the angular position of the center line of the arm relative to its line of eccentricity. In other words, a single die can be set at whatever position is necessary in order for the plane of symmetry of its semi-cylindrical driving shaft, a stamping arm extending radially with respect to said shaft, a stamping die carried by the end of said arm, means for adjusting the radial distance of said die from the axis or rotation of said shaft, said means comprising a collar fixed eccentrically to the shaft, a head portion of said arm surrounding said collar, cooperating means on said arm and said collar for adjusting the relative angular position there- 'of and means for fixing the arm to the collar in i. any position of their relative adjustment, a

shape to coincide with the axis of the rotating 1 shaft H, so that the die will give even and uniform impressions in any position of adjustment of the arm I9 relative to the eccentric collar l8 on the shaft. Among the various known means suitable for holding the die 23 in its desired position, there may be mentioned slotting the lower end of arm l9, as indicated at 20, from the apex of the semi-cylindrical surface 23b and clamping the bifurcated ends of the arms against the die by means of a bolt a; or an adhesive between the diesurface and the socket 23b might be employed, as will be apparent to those skilled in the art.

Mounted in frame ID is, further, a rgller 24 which forms part of the delivery track for the material to be stamped,

As will be apparent from the foregoing, the distance of the die above the roller 24 can be adjusted at will in a very simple manner merely by turning the worm. 22 which will rotate the head l9 about collar l8. To avoid breakage in the event of faulty adjustment of the head IQ, the roller 24 is supported on springs 25.

When not in operation, the head l9 will be in the position, shown in dottedlines in Fig. 2, in which it will. be held. by the brake I 1. When material is to be stamped, the brake I! is deenergized and the clutch l6 energized. This can be effected, for example, by means of a flagswitch, shown diagrammatically at FS, which is actuated by the movin material. Every time the arm l9 passes through its lowermost position and the die meets an article to be stamped on the roller 24, the die will sink into this article and mark it. When all the material has passed and been stamped, the clutch IE will be de-energized and a limit-switch 26, actuated by head l9 will energize the brake I! again to hold the head IS in its inoperative position.

A machine according to the invention can also I be. equipped with two stamping heads, side by side. In this case, the clutch and the shaft will have to be duplicated. One machine can then be so operated that only one of the two heads will rotate while the other is at a standstill so that its die can be exchanged.

What I claim is:

1. A rotary stamping machine having a rotary cylindrical seat on said arm for carrying said die, on which seat the die is adapted to be oscillated so that the die may be so positioned and held relative tosaid shaft that the axis of the shaft will lie in the plane of symmetry of the die in any relative angular position of said arm and said'collar, and means for releasably setting said die on said seat in any position of oscillation at which the die is so positioned.

2. A rotary stamping machine having a rotary driving shaft, a stamping arm extendin radially with respect to said shaft, a stamping die carried by the end of said arm, means for adjusting the radial distance of said die from the axis of rotation of said shaft, said means comprising a collar fixed eccentrically to said shaft, a head portion of said arm surrounding said collar, cooperating means on said arm and said collar for adjusting the relative angular position thereof and means for fixing the arm to the collar in any position of their relative adjustment, said die comprising a substantially semi-cylindrical holder having a chord-like face and impression elements providing a working surface projecting from said face, a substantially semi-cylindrical socket in the end of said arm in which said holder fits and is adapted to .be oscillated so that the die may be so positioned and held relative to said shaft that the axis of the shaft will lie in a REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 408,411 j Hey Aug. 6, 1889 545,059 Davis Aug. 27, 1895 833,275 White Oct.'16, 1906 1,063,413 Callahan June 3, 1912 1,910,278 Browning May 23, 1933 2,082,372 Wood June 1,193? 2,362,206 .Kronquest N0v."7,,1944

FOREIGN PATENTS Number Country Date Great Britain Aug. 22, 192 

